3D plot and contour plot

Question 1)

The following is my function z. Please help me to generate a 3D plot and a contour plot.

 function out=z(x,y,n)

 p=(1+sin(5*x))-(1/sqrt(8*(sin(x))))
 q=(1+sin(5*y))+(1/sqrt(8*(sin(y)))) 

if fix(n/2)==n/2
  out=n*(p+q)
 else
  out=(n-1)*(p+q)+p
end

x is in the range of 0 to 6, increment 0.1

y also in the range of 0 to 6, increment 0.1

z is in the range of -0.005 to -2.000

Answer 1

[Walter Roberson]

0) 0.1 is called the "increment" there

1) see mesh() and contour()

2) length(m) will be 101, or size(m) will show 1 101

3) Yes.

[Walter Roberson]

Also, see surf()

The meshgrid() that you had previously was a good start.

[Enfa White]

I tried with the following codes:

function out=z(~,~)

x = linspace(0,6,61); y = linspace(0,6,61);

p=(1+sin(5*x))-(1/sqrt(8*(sin(x)))); q=(1+sin(5*y))+(1/sqrt(8*(sin(y))));

out=(16*(p+q))/2+p;

[x,y] = meshgrid(0:0.1:6,0:0.1:6);

figure surfc(x,y,z); shading interp;

title('A function','FontSize',16) axis([0 6 0 6 -0.005 -2.000])

But I got the following errors, please advise:

??? Error using ==> mldivide Matrix dimensions must agree.

Error in ==> z at 6 p=(1+sin(5*x))-(1/sqrt(8*(sin(x))));

[Walter Roberson]

Change the 1/ to 1./

[Enfa White]

I already tried to change / to ./ at the following equations:

p=(1+sin(5*x))-(1./sqrt(8*(sin(x)))); q=(1+sin(5*x))+(1./sqrt(8*(sin(x))));

out=(16*(p+q))./2+p;

When I run it, the empty figure keep opening continuously until I terminate the Matlab program. By the way is there any command that I can enter at the command window to stop this problem? TQ.